How to use rays after creating them?

Im trying to make a gun so i made this script (you dont need to read it lol):

	local pistola = script.Parent
	local hole = game.StarterPack.Pistola.Hole
	local mouse = game.Players.LocalPlayer:GetMouse()
	 
	-- Lista de Valores --
	local ammo = 12
	local maxAmmo = 64
	local damage = 20
	local headshotDamage = 50
	local range = 100
	-- impedir spamming --
	local spam = false
	 
	    -- Disparo --
	    pistola.Activated:Connect(function()
	        if spam == false then
	             spam = true
	            pistola.Handle.Disparo:Play()
	           local bullet = Instance.new("Part")
	           bullet.Size = Vector3.new(range,0.25,0.25)
	           bullet.Position = hole.Position
	           bullet.Transparency = 0.5
	           bullet.CanCollide = false
	           bullet.Anchored = true
	           bullet.Parent = game.Workspace
	        wait(0.5)
	        bullet:Destroy()
	            spam = false
	        end
	    end)

But then i couldn't set the position so i asked another question at this website and i found out i have to use a ray so i ended up with this new script:

	local pistola = script.Parent
	local hole = game.StarterPack.Pistola.Hole
	local mouse = game.Players.LocalPlayer:GetMouse()
	 
	-- Lista de Valores --
	local ammo = 12
	local maxAmmo = 64
	local damage = 20
	local headshotDamage = 50
	local range = 100
	-- impedir spamming --
	local spam = false
	 
	    -- Disparo --
	    pistola.Activated:Connect(function()
	        if spam == false then
	             spam = true
	            pistola.Handle.Disparo:Play()
	           local bullet = Instance.new("Part")
                    local ray = Ray.new(hole.CFrame.Position, (mouse.Hit.Position - hole.CFrame.Position).Unit*number)
	           bullet.Size = Vector3.new(range,0.25,0.25)
	           bullet.Position = hole.Position
	           bullet.Transparency = 0.5
	           bullet.CanCollide = false
	           bullet.Anchored = true
	           bullet.Parent = game.Workspace
	        wait(0.5)
	        bullet:Destroy()
	            spam = false
	        end
	    end)

But it didn't work either so i went to watch some tutorials about making guns on roblox and i found out that they used raycasting too, so im trying to find out how to use my ray. Pls explain me how to use the ray and also a fix if you could. :D